Broadband ISDN (B-ISDN) is an extension of ISDN that provides both narrowband and broadband capabilities over digital networks. It supports interactive and distributive services using Asynchronous Transfer Mode (ATM), which transmits data in small, fixed-size cells. ATM provides either permanent or switched virtual connections and uses small, constant cell sizes to transmit video, audio, and computer data over the same network.

1. BROADBAND ISDN
AND ATM
Presented By
M.LAVANYA
M Sc (CS&IT)

2. INTRODUCTION
• BISDN is an extension of ISDN in term of capabilities, i.e. it not only has the
narrowband capability of ISDN but also the broadband capability.
• ISDN, which means Integrated Service Digital Network.
• It is a set of CCITT/ITU standards for digital transmission over ordinary telephone
copper wire as well as over other media.
• ISDN is the integration of both analogue or voice data , together with digital data
over the same network.

3. ARCHITECTURE

4. B – ISDN SERVICES
• Interactive Services
 Conversational Services
 Messaging Services
 Retrieval Services
• Distributive Services
 No User Control of Presentation
 User Control of Presentation

5. • ISDN is an underlying technology, which privies cost-effective networking through
the public telephone networks.
• ISDN is an important step forward in the adaptation of the network to handle the
increasing global demand for computer-to computer data communications.
• ISDN brings us closer to the goal of a ubiquitous multi-service network, integrating
voice, data, voice and image.

6. BROADBAND (FDM , true simultaneous)

7. BROADBAND CONNECTION
• much greater bandwidth than modems.
• DSL uses standard phone lines and is provided y phone companies in many areas.
• Cable Modems provide fast network connections through cable television
networks in many areas.
• High-Speed Wireless connections can connect computers to networks sing radio
waves rather than wires.
• Satellite Dishes can deliver fast computer network connections as well as television
programs.

9. CABLE BROADBAND : ADVANTAGES & DISADVANTAGES.
• ADVANTAGES:
High speed connection.
Always on.
Easy installation.
• DISADVANTAGES:
Not available to all TV networks.
This can cause congestion which slows down /upload speeds.
Requires TV connection.

10. ASYNCHRONOUS TRANSFR MODE(ATM)
• Asynchronous Transfer Mode, a network technology based on transferring data in
cells or packets of a fixed size.
• Asynchronous transfer mode is the cell relay protocol designed by the ATM Forum
and adopted by the ITU-T.
• The cell used with ATM is relatively small compared to units used with older
technologies.
• ATM was developed to meet the need of the “Broadband Integrated service
digital network” and designed to telecommunication and computer network.
• The small, constant cell size allows ATM equipment to transmit video, audio, and
computer data over the same network.

11. ASYNCHRONOUS TRANSFER MODE(ATM)

12. ATM USES TWO TYPES OF CONNECTION
• ATM provides permanent virtual connections and switched virtual connections.
• Permanent virtual connections(PVC)
permanent connections set up manually by network manager.
• Switched virtual connections(SVC)
Setup and released on demand by the end user via signaling procedures.

13. ATM SOLUTION – ATM NETWORK
• Uses ATM switch in star.
• Communication via switch.
• Network is highly scalable.
• Extremely high data rates – 1.544Mbps to 155Mpbs.
• 2 OFC between host and switch for full duplex line.
• Developed as part of broadband ISDN.
• Used in private non – ISDN networks.
• Also called Cell Relay.
• Higher and Lower speeds are possible.

14. ATM PROTOCOL STACK